Decomposition of terpenes by ozone during sampling on Tenax
The ozonolytic decomposition of terpenes and terpenoids during sampling on Tenax is investigated in an artificial air system at ambient concentration levels. The detrimental effect of 8-150 ppbv ozone depends on the chemical structure of the compounds: saturated terpenoids such as 1,8-cineole, camphor, and bornyl acetate are unaffected by ozone. The analytical recoveries are significantly enhanced for many compounds when the sampling duration is reduced from 10 m to 30 s, explained by the time available for ozonolysis. A miniature ozone scrubber with multiple layers of MnO(2)-coated copper nets has been developed and tested. The optimal number of plies is found to be eight, which ensures quantitative recoveries for all test compounds except alpha-terpinene, beta-caryophyllene, citral and citronellal. The results that are reported call into question previous data on terpenes and terpenoids and/or their oxidation products where measurements have been carried out without the prior removal of ozone.
Bibliographic Reference: Article: Analytical Chemistry (1995)
Record Number: 199511220 / Last updated on: 1995-10-10
Original language: en
Available languages: en